Did you know that the discovery of other planets in orbit around other stars is a very recent one?  Only 25 years ago, we had no idea there were any planets in our galaxy besides those in our solar system.  Now, not only have we discovered them, but astronomers estimate there are trillions of them.  There are so many exoplanets out there that every star in our galaxy could have at least one.

 

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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

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